无法在ios

Question

我正在使用ios 11，swift 4并使用av基础库捕获图片。我有一个自定义预览，如图所示，mysettings如建议。问题是当我捕获并保存CMSample缓冲区时，它是leftLandscape。我试图更改CapturePhotoOutput方向，但它不能改变？（更改photoOutputConnection.videoOrientation什么都不改变？）

if let photoOutputConnection = capturePhotoOutput.connection(with: AVMediaType.video) {

    if(photoOutputConnection.isVideoOrientationSupported)   {
        print("video oryantasyonu = \(photoOutputConnection.videoOrientation)")
    } else {
        print("video oryantasyonu desteklenmiyor ?!")
    }
}

这是预览（唱机屏幕）：

这是从xcode调试快速视图中获取的捕获输出：

这是会话配置：

self.capturePhotoOutput = AVCapturePhotoOutput()

capturePhotoOutput.isHighResolutionCaptureEnabled = true

//  A Live Photo captures both a still image and a short movie centered on the moment of capture,

//  which are presented together in user interfaces such as the Photos app.

capturePhotoOutput.isLivePhotoCaptureEnabled = capturePhotoOutput.isLivePhotoCaptureSupported

guard self.captureSession.canAddOutput(capturePhotoOutput) else { return }

//  The sessionPreset property of the capture session defines the resolution and quality level of the video output.

//  For most photo capture purposes, it is best set to AVCaptureSessionPresetPhoto to deliver high resolution photo quality output.

self.captureSession.sessionPreset = AVCaptureSession.Preset.photo

self.captureSession.addOutput(capturePhotoOutput)

self.captureSession.commitConfiguration()